Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 67

Existing
Function
Terminals
Common
B
Power
R
Compressor
Y
1st Stage
–
Heat
Aux. Heat
W
Fan
G
Outdoor
T
Thermistor
Outdoor
X2
Thermostat
Cooling
O
Changeover
System
F
Monitor
2nd Stage
–
Compressor
2nd Stage
–
Cool
For best performance, use a NEMA standard transformer.
Terminal B (C) must be connected to transformer common.
Configure O/B (select models) in Installer Setup.
Leave factory-installed jumper in place.
T874R1566/Q674L1538
Electromechanical
B B B
R R R
Y Y Y
– – –
W W W
G G G
T T T
X2 X2 X2
O O O
F F F
– – –
– – –
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER
Electronic Replacement or Upgrade
®
Chronotherm
III
C C
R R
or
Y1 Y Y
W1 W1
W2 W2
G G
E E
O O
L L
– –
– –
No connection. Tape off.
When W2 is not used, configure W2 cycle rate to NC.
LED is energized when terminal is powered.
L terminal is powered continuously when thermostat is in Em. Ht. position.
T841A1068
HONEYWELL
MODELS USING OUTDOOR RESET
Chronotherm
IV
C C C
R R R
Y1 Y Y1
W1 W1 W1
W2 W2 W2
G G G
E E E
or or
O O/B O O
L L L
– – –
– – –
T874R1053/Q674L1140
C
R
Y1/W1
–
Aux.
G
E
O/B O/B
L
W2
Y2
M13189
70-6627 • 65